Inspecting closely, Gandalf's comment about the enemy returning, which itself

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may not be spoken in the same scene as the "We've been blind" comment, may be spoken near the High Fells not outside of Dol Guldur. It looks more like a closeup version of his commentary to Radagast at the beginning of vlog 11 (or 12?) rather than the scene of them outside of Dol Guldur in trailer 1. Merely a thought. "Hear me, hounds of Sauron, Gandalf is here! Fly if you value your foul skins, I will shrivel you from tail to snout if you step within this circle!"

"Do not be to eager to deal out death in judgement. Even the very wise cannot see all ends."

Radagasts line from the Vlog "if what you say is true..." just fits PERFECTLY right after Gandalfs "We have been blind...". Also, the expression of Gandalfs face is the same in the Vlog and the trailer.

Trailers are often chopped up. But still, the trailer-makers chose scenes in ways that at least give an idea about the nature of characters.

Thranduil isn't about to bargain or really help the dwarves - but a novice going in with knowledge of other elf-lords from LOTR might not realize that.

But they're definitely referring to Bard. He's the most rogue-like character in either trilogy, and has a whole different vibe than Aragorn ever had (less of a "gold that doesn't glitter" and just extremely dour and grim).